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Nothing is wrong with PEX, but it can't handle the water pressure that sch 40 CPVC can, so it isn't as good of a sight-unseen recommendation. Also, you need special tools to assemble PEX. CPVC goes together with the same kind of cements we use outdoors on ordinary PVC.

The distinction of using CPVC for indoor work, as opposed to the less expensive PVC, comes from codes that no longer allow the indoor use of PVC for potable cold-water use.

You need a way to blow out your lines in the Fall. A tee with a threaded end in which you insert a threaded plug - or something compatable. Not sure where you would put it, wait for the pros to respond. Wait a second - are you talking about a PVB? - pressure vacuum breaker? If so, they go outside and below it you can install the tee I was referring to. Might be a better way to do it, but that's what I did. Also, consider a PVB with built in unions so you can take it inside in the winter.

Wetboots? How about pex with bite fittings for the inside work? Pex is cheaper than copper and easy to install, but the bites are expensive.

take your time and buy the copper at a real plumbing supply, if you want a minimum of fuss - the key item will be the 3/4 x 3/4 x 1 "bullhead" copper tee, which the home centers may not carry

If you do want to cheap out on material, I would recommend using CPVC plastic pipe and fittings, as it will definitely be strong enough, and it doesn't present the "instant inspection failure" that the ordinary white PVC pipe and fittings will, when used indoors.

would i be able to get this online? i live in northern ct right near a FW webb so would they have it? i would rather order it if i could because i am out of the country right now and would like to have it when i get home